<template>
  <div>
    <template>
      <div class="article-container">
        <!-- 导航栏 -->
        <van-nav-bar
          class="page-nav-bar"
          left-arrow
          title="黑马头条"
          @click-left="$router.go(-1)"
        ></van-nav-bar>
        <!-- /导航栏 -->

        <div class="main-wrap">
          <!-- 加载中 -->
          <div v-if="isLoading" class="loading-wrap">
            <van-loading
              color="#3296fa"
              vertical
            >加载中</van-loading>
          </div>
          <!-- /加载中 -->

          <!-- 加载完成-文章详情 -->
          <div v-else-if="article.title" class="article-detail">
            <!-- 文章标题 -->
            <h1 class="article-title">{{article.title}}</h1>
            <!-- /文章标题 -->

            <!-- 用户信息 -->
            <van-cell class="user-info" center :border="false">
              <van-image
                class="avatar"
                slot="icon"
                round
                fit="cover"
                :src="article.aut_photo"
              />
              <div slot="title" class="user-name">{{article.aut_name}}</div>
              <div slot="label" class="publish-date">{{article.pubdate | formatDate}}</div>
              <followUser
                :is_followed="article.is_followed"
                :user_id="article.aut_id"
                v-model="article.is_followed"
              />
              <!-- @updateFollow='article.is_followed = $event' /> -->
              <!-- <van-button
                class="follow-btn"
                type="info"
                color="#3296fa"
                round
                size="small"
                icon="plus"
                v-if="!article.is_followed"
                @click="onFollowed"
                :loading='isFollowLoading'
              >关注</van-button>
              <van-button
                class="follow-btn"
                round
                size="small"
                v-else
                @click="onFollowed"
                :loading='isFollowLoading'
              >已关注</van-button> -->
            </van-cell>
            <!-- /用户信息 -->

            <!-- 文章内容 -->
            <div ref="content" class="article-content markdown-body" v-html="article.content"></div>
            <van-divider>正文结束</van-divider>
            <!-- 文章评论 -->
            <Commomlist @on-reply='onReply' :list='list' type='a' :source='articleId' @onload-success='total = $event' />
            <!-- /文章评论 -->
            <!-- 底部区域 -->
            <div class="article-bottom">
              <van-button
                class="comment-btn"
                type="default"
                round
                size="small"
                @click='isPopupShow = true'
              >写评论</van-button>
              <van-icon
                name="comment-o"
                :info="total"
                color="#777"
              />
              <articleColle
              v-model="article.is_collected"
              :articleId="article.art_id"/>
              <!-- <van-icon
                color="#777"
                name="star-o"
              /> -->
              <van-icon
                color="#777"
                name="good-job-o"
              />
              <van-icon name="share" color="#777777"></van-icon>
            </div>
            <!-- /底部区域 -->
            <!-- 评论弹出层 -->
            <van-popup v-model="isPopupShow" position="bottom" >
              <CommomPost :target='articleId' @postSuccess='onPostSuccess' />
            </van-popup>
          </div>
          <!-- /加载完成-文章详情 -->

          <!-- 加载失败：404 -->
          <div v-else-if="errStatus === 404" class="error-wrap">
            <van-icon name="failure" />
            <p class="text">该资源不存在或已删除！</p>
          </div>
          <!-- /加载失败：404 -->

          <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
          <div v-else class="error-wrap">
            <van-icon name="failure" />
            <p class="text">内容加载失败！</p>
            <van-button @click='loadArticleDetail' class="retry-btn">点击重试</van-button>
          </div>
          <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
        </div>
        <!-- 评论回复 -->
        <van-popup
          v-model="isReplyShow"
          position="bottom"
          style="height: 100%"
        >
          <CommentReploy v-if="isReplyShow" @close-popup="isReplyShow = false" :comment="comment" />
        </van-popup>
        <!-- /评论回复 -->
      </div>
    </template>
  </div>
</template>

<script>
import { getArticleDetail } from '@/api/article.js'
import '@/styles/github-markdown.less'
import { ImagePreview } from 'vant'
import followUser from '@/components/follow-user'
import articleColle from '@/components/article-collet'
import Commomlist from './components/common-list.vue'
import CommomPost from './components/comment-post.vue'
import CommentReploy from './components/comment-reploy.vue'

export default {
  name: 'articleDetail',
  data () {
    return {
      // 详情数据
      article: {},
      isLoading: true,
      // 错误状态码
      errStatus: 200,
      total: 0,
      // 控制评论的显示与隐藏
      isPopupShow: false,
      list: [],
      isReplyShow: false,
      comment: {}
    }
  },
  props: {
    // 路由映射的文章id
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  provide () {
    return {
      articleId: this.articleId
    }
  },
  components: {
    followUser,
    articleColle,
    Commomlist,
    CommomPost,
    CommentReploy
  },
  created () {
    this.loadArticleDetail()
  },

  methods: {
    async loadArticleDetail () {
      this.isLoading = true
      try {
        const { data: res } = await getArticleDetail(this.articleId)
        if (Math.random() < 0.5) {
          console.lg(12)
        }
        this.article = res.data
        this.isLoading = false
        this.$nextTick(_ => {
          this.previewImg()
        })
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
        this.$toast('获取失败!')
        this.isLoading = false
      }
    },
    // 图片预览
    previewImg () {
      const content1 = this.$refs.content
      const imgs = content1.querySelectorAll('img')
      const images = []
      imgs.forEach((element, index) => {
        images.push(element.src)
        element.onclick = () => {
          ImagePreview({
            // 所有图片列表
            images,
            // 指定图片起始位置
            startPosition: index
          })
        }
      })
    },
    onPostSuccess (e) {
      this.list.unshift(e)
      this.isPopupShow = false
    },
    onReply (e) {
      this.comment = e
      this.isReplyShow = true
    }
  }
}
</script>

<style scoped lang='less'>
  .article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
